Table 5.

Change in mean latent postoperative Oxford Knee Score in primary TKA (primary diagnosis osteoarthritis)

Term	Estimate (95% CI)	p value
Intercept	28.85 (26.21 to 31.50)	< 0.001
Age in years	0.00 (-0.02 to 0.03)	0.69
ASA classificationa
ASA 1	4.14 (1.92 to 6.36)	< 0.001
ASA 2	2.76 (0.71 to 4.81)	0.01
ASA 3	1.94 (-0.09 to 3.97)	0.06
BMI class in kg/m2b
Underweight < 18.5 or normal 18.5-24.9	0.81 (-0.07 to 1.69)	0.07
Preobese 25.0 to 29.9	0.62 (-0.10 to 1.34)	0.09
Obese Class 1 30.0 to 34.9	0.13 (-0.55 to 0.81)	0.70
Obese Class 2 35.0 to 39.9	-0.09 (-0.80 to 0.62)	0.80
Surgeon 2-year CPR	-0.29 (-0.51 to -0.06)	0.01
Preoperative Oxford Knee Score	0.28 (0.25 to 0.30)	< 0.001
Gender
Men	0.31 (-0.09 to 0.71)	0.13
Variance components
Surgeon	1.53 (0.95 to 2.45)	< 0.001

There were 6240 patients; residual variance estimate = 57.1.

^aThe reference category for ASA is ASA 4 or 5.

^bThe reference category for BMI is obese Class 3 (≥ 40.0 kg/m²). ASA = American Society of Anesthesiologists; CPR = cumulative percent revision.